[OSM-talk] trunk_link & ref=*

[Richard Fairhurst]

Dave F. wrote:
> Would they not be essential for routing software?

Routing software by its nature will preprocess the OSM data: you'd be insane
to route over raw OSM data (though I'm sure someone's doing it). Gosmore,
for example, preprocesses it into .pak files.

As part of that, the routing software can add whatever road number it sees
fit. It's not a Hard Problem. If, say, you have a motorway slip road that
leads to a roundabout, and the A46 and the A429 converge at that roundabout,
a router might choose to add a "hint" of the A46/A429 to its internal
representation of the slip road.

As ever, optimise for the mapper, not the client.

cheers
Richard
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